Scalable Synthesis of Bimetallic CoFe Alloy Nanoparticles for Efficient Oxygen Evolution Reaction

Abstract

The development of efficient electrocatalysts towards oxygen evolution reaction (OER) is critical for large-scale applications of electrochemical water splitting and metal-air cells. Usually, transition metal alloys exhibit superior activity for OER. Herein, we successfully prepared a series of scalable transition metal alloys with homogeneous size by a facial sol-gel self-propagating combustion method. Among them, the CoFe alloy displayed the highest oxygen evolution reaction (OER) activity, achieving an overpotential of 310 mV at 10 mA cm À 2 . After running OER tests for 48 h, the activity of CoFe alloy hardly decayed, indicating its outstanding stability. This work may make some contributions to the production of promising transition metal alloy catalysts and related energy equipment applications.

Spectroscopic and electrochemical characterizations of copper complexes with thionine, azure C and azure A

“…As a result, no solvent molecules were observed in the IR spectra after drying at 60 °C before measurement. A slow increase in the amount of 7% weight loss at 100–300 °C was attributed to the decomposition of complexes or to start the loss of the organic ligand 1,29 . This fact showed that the drying procedure could be performed for 6 hours and a maximum of 80 °C in a vacuum oven.…”

“…The second part was CuCl 3 − formed by joining Cl − in PTZ + Cl − salt to CuCl 2 . According to previous DFT modelling studies, it is proposed that complex formation takes place between the S 27 and N 28,31 within the dyestuff's skeleton structure or the N atoms in the methyl groups, 29 and the metal or ametal atom in the salts. The most remarkable point in this study was the homogeneously and entirely delocalized electron density of the PTZ + group, and the latter was the halogen–hydrogen bonding (Cl … H) that increased the stability of PTZ + [CuCl 3 ] − complexes from Figure 11 and Table 4.…”

“…There are limited studies of metal salts of cationic PTZ‐derived molecules on this matter in the literature 27–31 . Zhang et al succeeded the submicrometer 1D supramolecular [HgCl 2 (PTZ)] 2 .HgCl 2 rods with the interaction of the PTZ molecules with HgCl 2 27 .…”

Convenient Synthesis of NiCo Alloy Nanoparticles Encapsulated by N-Doped Porous Carbon for the Oxygen Evolution Reaction

“…In Figure f, the O 1s spectrum mainly consists of three peaks, namely lattice oxygen (529.5 eV), OH – (531.8 eV), and adsorbed water (532.8 eV), − which proves the existence of O-containing functional groups on the nitrogen-doped carbon framework. The lattice oxygen generation may be caused by partial oxidation of the sample surface during XPS operation. , …”

In situ self-reconstructed hierarchical bimetallic oxyhydroxide nanosheets of metallic sulfides for high-efficiency electrochemical water splitting

“…27,43,44 The aforementioned research elucidates that strong electronic interactions between Co and Fe elements can optimize the adsorption/desorption of intermediates in the OER, enhancing the activity of S-FeCo 1 : 1 /NIF, as corroborated by numerous studies. 41,45,46 Moreover, as shown in Fig. 2i, the S 2p spectrum of S-FeCo 1 : 1 /NIF exhibits two peaks at 161.83 and 164.26 eV, corresponding to S 2p 1/2 and S 2p 3/2 of S 2À , indicating the formation of metal-S bonds in S-FeCo 1 : 1 /NIF.…”